Davits.



R. DE LAN.

DAVITS.

APPLICATION FILED AUG.3I. 19:2.

Patented Dec. 14, 1915.

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R. DE L'AN.

DAVITS.

APPLICATION FILED AUG.3I. 19x2.

1,163,977. Patented Dec. 14, 1915.

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COLUMBIA PLANOGRAPH C0,,WA5HINOTON. D. c.

R. DE LAN.

7 DAVITS.

APPLICATION FILED AUG-3], I9I2. 1,,163,97?. 1 Patented Dec. 14, 1915.

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45 which is stepped the end of the davit 4, the

' WITED %TATES PATENT @FFIQE. i

RICHIE DE LAN, 0F PHILADELPHIA, PENNSYLVANIA.

Specification of Letters Patent.

Patented Dec. 14, 1215.

Application filed August 31, 1912. 'Serial No. 717,995.

adapted to be swung away from the ships side, as a boat is lowered, in order to prevent the boat as it is lowered from striking the side of the ship as she rolls. For this purposea special guide-way is provided for the davit, as it swings out and a special screwjack for controlling the motion of the davit. Theguide-way is arranged to swing against the side of the ship when not in use.

, In order to with safety load the boat to its full capacity before lowering, I provide the boat with a central point of attachment, and also provide central falls in addition to the forward and after ones. I have further devised a novel construction of automatic twin hooks for attaching the fall blocks to the boat. 7

In the accompanying drawings, Figure I, is a side elevation of davits constructed according to my invention, the boat which they carry being shown slung at the side of the ship. Fig. II, is a sectional View along the line II, II, of Fig. I. Fig. III, is a similar view along the line II, II, of Fig. I, showing the davit swung out from the ship. Fig. IV, is an enlarged horizontal section along the line IV, IV, of Fig. II. Fig. V, is a vertical section along the line V,-V,.of Fig. IV. Fig. VI, isa partial vertical section along the line VI, VI, of Fig. IV. Figs. VII, VIII, IX, X, XI, XII, XIII, XIV, and XV, are detail views of parts which will be referred to during the description. To the ships side 1, there is secured a bracket 2, provided with a socket 8, into lower end of the davit being conveniently provided with a ball or head 5, for the purpose of being received within the socket. The socket is further provided With a guiding slot 6.

The guide-way for the davit consists of two parts, a fixed part 10, and a movable way 11. The fixed part 10, is secured as shown to the top of the rail of the ship. It

' is provided with a round. hole 12, in which the davit may rotate and a narrower slot-13,

which constitutes the fixed portion of the guide-way, and which is of sufficient width to receive a reduced portion 14, of the davit when it is turned in line with the slot.

The movable or swinging way 11, is provided in its top with a slot 15, which when the way is swung out registers with and forms a continuation of the slot 13. It is pivoted by a bolt 16, to one corner of the fixed portion of the guide-way. The opposite corner of the swinging way is provided with a dog 17, which falls into a hole 18, in the fixed way looking it in position when swung out. The lower end of the swinging way contains a bearing 19, which is received in a pivot hole 20, in a projecting web 21,

formed on the lower end of the bracket2. When the swinging way is swung back alongside of the ship, it is held in position by a detent 22, fast to a bracket 23.

A special keeper 25, is provided for the purpose of holding the davit upright when it is not in use. This keeper has downwardly projecting ends 27, which are received within appropriate slots 28, at the sides of the fixed way 10. The keeper is provided with a slot 30, of sufiicient width to receive the narrowed portion 14, of the davit 4, and restrain it from turning when the keeper is in place. An alternative form of keeper is shown in Fig. X, at 40, differing only that instead of being chained to the way, it is fastened thereto by a bolt and thumb screw 41, the bolt passing through a slot 42, in the projecting end of the keeper,

and having a threaded aperture receiving the. cylindrical collar 54, which is oppositely threaded within 'and without, so that its outer thread engages the inside of the block 53, while its inner thread engages a threaded rod 55, provided at its outer end with a yoke 56, which detachably engages a collar 57, clamped to the davit. The handle 50 is attached to the cylindrical collar 54 and by turning said collar the same will be moved in one direction in the block 53 and this turning of the collar will move the threaded rod 55 in the same direction in said cyllndrical collar The rapidity with which the davit may he swung out is thereby in creased.

When not in use, the screw-jack is detached from the collar on the davit by removal of the pin 58, which is of the special construction shown in Fig. XIII. The entire scrmv-jack is then swung upon its trunnions into the vertical position seen in Fig. IX.

The collar 57, is split as shown in Fig. XII, where there is also shown the reduced portion 59, of the davit at, which is received within the collar. These two portions are bolted together at their outer ends upon the davit. One of the portions carries a projecting block through which the pin 58, is inserted for attachment of the screw jack to the collar. .Except when a boat is to be lowered the swinging way 11, is swung around for stowage parallel to the rail of the ship and held in place there by the detent 22, as explained. At the same time, the keeper 25, locks the davit in its innermost position and holds it so that it cannot rotate.

. When a boat is to be lowered the screwjack is turned horizontally and attached by the pin 58, to the collar which surrounds thedavit. The keeper 25, is removed whereupon the davit may be swung out. The swinging way is swung out and locked at right angles to the rail of the ship by the dog 17. lVhen the boat'is ready to be lowered the davit is swung out from the ship upon the socket joint at its lower end by rotation of the screw-jack, to which motion the pivotal joint between the end of the screw-jack and the collar and also the pivotal joint between the ball of the screwjack and its support conduce so that the davit can take the position shown in Fig. III, in which position the boat is heldso far out from the side of the ship as to prevent its being thrown against the side of the ship as it rolls.

I have not described the block and tackle by which the boat is swung from the davits, as in many respects it is similar to that in common use, but according to my present invention, in order to increase the load which it may carry, with safety when slung from the davit, I provide the boat with a central attachment for a fall block. At the bottom of the boat and centrally, a special eye 60, is clamped by screw bolts 61, 61, passing through metal plates 62, on either side of the bottom of the boat preferably with interposition of coiled springs 63, between the nuts 64, upon the screw bolt and the base of the eye. This tempers the jar attendant upon hooking on the boat in a sea; way. The upper block, of the central falls,is hooked (through the connection of a pierced link), to the ring that connects the two halves of the chain span; the center eye,

in this link, acts as a fair leader to the equalizing part of the forward, and after falls. From this upper block 70, to the lower block attached .to the eye 60, I reeve the central fall.

The falls connected with the davits are provided with automatic twin hooks of spe-,

cial construction shown in Fig. XIV. These comprise a pivot 80, and two twin hooks 81, 81, with flat sides working close to gether and provided with overhanging hooks 82, and separating lugs 83. The parts are so weighted that under the ordinary circumstances, the twin hooks hang parallel each closing the hook of the other, but the two lugs 83, being on opposed corners are separated sutiiciently to allow the bolt or eye to wedge between them and separate them as the hooks are lowered. The surface of the lower inner edge of each hook is appropriately inclined between the lug boat has reached the water and the tackle which carries the same becomes slack the weight of the hooks causes them to separate, the inclined faces 85, between the bight of each hook and the part surrounding the pivot, operating as cam surfaces tending to wedge the hooks apart until they are auto matically detached and fall away.

Having thus described my invention, I claim: 7

1. The combination of a davit attached to the side of a ship by means which permit it to swing out from the ship, aguide-way for the davit as it swings out, and means whereby said guide-way may be swung parallel to the side of the ship when not in use. 7

2. The combination of a davit attached to the side of a ship by means which permit it to swing out from the ship, a slottedguideway embracing and guiding a flattened portion of said davit but restraining its rotation, and a larger apertureat the fixed e'x tremity of the guide-way which permits r0 tation of the davit. V

- 3. The combination of a davit adapted to be attached to the side of a ship by means which permit it to swing out'from the ship, a two-part guideway, one part of which is fixed and the other of which may be swung parallel to the side of the ship when not in use, said two-part guideway having a slot extending fromthe fixed part into 'them0v able part, and means for closing the end of the slot in the fixed part when the movable part is turned against the side of the ship. 4:. The combination of a davit adapted to be attached to the side of a ship by means which permit it to swing out from the ship, a two-part guideway, one part of which is fixed and theother of which may be swung parallel to the side of the ship when not in use, said two-part guide-way having a slot extending from the fixed part into the movable part, and means for closing the end of the slot inthe fixed part when the movable part is turned against the side of the ship, said davit having flattened side portions adapted to engage said slot, said slot in the fixed part at the inner end thereof being enlarged, whereby said davit may be rotated.

5. 'The combination of a davit attached to the sideofia' ship by means which permit it to swing out from the ship and a screwjack attached to one side of said davit, said screw-jack including a threaded block, a fixed bracket supporting said block, a cylindrical collar having a thread on its outer surface adapted to engage said threaded block and an oppositely wound thread on the inner surface, a rod adapted to be attached to the davit and cooperating with said inner threaded surface, means attached to the in ner end of said threaded collar whereby the same may be rotated, a guideway for the davit as it swings out, and means whereby the guideway may be swung parallel to the side of the ship when not in use.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this twenty-ninth day of August, 1912.

RICHIE DE LAN.

Witnesses:

JAMES H. BELL, E. L. FULLERTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

